only apply image css to the comic images

assets/css/styles.css

@@ -27,13 +27,13 @@ fieldset {
     box-shadow: 0 1px 2px rgba(0,0,0,.3);
 }
 
-img {
+.imgUrl {
     float: center;
     height: 200px;
     padding: 5px;
 }
 
-img:hover {
+.imgUrl:hover {
     -webkit-transform: scale(1.1);
 	transform: scale(1.1);
 }
\ No newline at end of file